This peptide is Histone H3 (21-43) acetylated at lysine 27 with a C-terminal GG linker followed by a biotinylated lysine. The acetylation of histone H3 at lysine 27 is associated with many active mammalian genes. In Arabidopsis thaliana, the acetylated histone at lysine 27 is nontransposable element gene-specific. Provided at >95% peptide purity, this peptide was dissolved in distilled water at 1 mg/ml and re-lyophilized to powder form.